Consequences of adding the missing oscillator?

Official Hardware UNO Family UNO R4 Minima
1

I have a system I am prototyping with an Uno R4 Minima, and am planning to move this system to it's own PCB, but would like to continue using the Arduino core. When going over hardware design I saw that Renesas recommends adding a crystal for certain designs, while the R4 leaves it off. If I were to incorporate a 16 Mhz oscillator into my design, would I need to edit the Arduino Renesas Core to use the chip properly?

1 Like
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Yes.

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Is there any info on making this change to the core? It seems like this file might contain what would help me achieve this, but this is definitely above my skill level. Edit: it looks like it was originally setup to take a 16Mhz clock signal here.

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Have a read of this thread, it has some very interesting points.
Uno R4 shematics

I understand that the schematics have been updated since this thread with rather crude red crosses on the no fit components.

Also that a 16MHz crystal is too fast to operate the PLL and so this would slow down the actual running clock speed drastically.